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Updated: May 25, 2025
M. Wilsing's of 5·58, obtained at Potsdam in 1889, nearly agreed with it; while Professor Poynting, by means of a common balance, arrived at a terrestrial mean density of 5·49. Professor Boys next entered the field with an exquisite apparatus, in which a quartz fibre performed the functions of a torsion-rod; and the figure 5·53 determined by him, and exactly confirmed by Dr.
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